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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1984 (Transfer Case - Four Wheel Drive (4WD) Systems) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems >> Pinpoint Tests >> Pinpoint Test D: DTCs P1824/P1825 - 4-Wheel Drive Clutch Relay Circuit Failure/4-Wheel Drive Clutch Relay Open Circuit >> PINPOINT TEST D: DTCs P1824/P1825 - 4-WHEEL DRIVE CLUTCH RELAY CIRCUIT FAILURE/4- WHEEL DRIVE CLUTCH RELAY OPEN CIRCUIT

PINPOINT TEST D: DTCs P1824/P1825 - 4-WHEEL DRIVE CLUTCH RELAY CIRCUIT FAILURE/4- WHEEL DRIVE CLUTCH RELAY OPEN CIRCUIT

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Carry out a thorough inspection and verification as outlined before carrying out this pinpoint test. Refer to INSPECTION AND VERIFICATION .
  1. D1 CHECK FOR 4X4 CONTROL MODULE DTCs 
    • Ignition ON.
    • Carry out the 4X4 control module self-test.
    • Are any DTCs received? 
  2. D2 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR A SHORT TO GROUND WITH ATC SOLENOID (PART OF REAR AXLE) CONNECTED 
    • Ignition OFF.
    • Disconnect: 4X4 Control Module C281.
    • Measure the resistance between 4X4 control module C281-8, circuit CCF21 (VT/WH), harness side and ground; and between 4X4 control module C281-16, circuit RCF21 (WH/VT), harness side and ground.
      Fig 1: Measuring Resistance Between 4X4 Control Module C281-8, Circuit CCF21 (VT/WH), Harness Side And Ground
      G06064360Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  GO to  D5.
    • No:  GO to D3  .
  3. D3 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR A SHORT TO GROUND WITH C4004 DISCONNECTED 
    • Disconnect: ATC  Solenoid Jumper Harness C4004.
    • Measure the resistance between 4X4 control module C281-8, circuit CCF21 (VT/WH), harness side and ground; and between 4X4 control module C281-16, circuit RCF21 (WH/VT), harness side and ground.
      Fig 2: Measuring Resistance Between 4X4 Control Module C281-8, Circuit CCF21 (VT/WH), Harness Side And Ground
      G06064360Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  GO to D4  .
    • No:  REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.
  4. D4 CHECKING THE ATC SOLENOID JUMPER HARNESS 
    NOTE: The ATC  solenoid jumper harness must be secured to prevent damage to the wiring.
    • Disconnect: ATC  Solenoid C4347.
    • Inspect the ATC  solenoid jumper harness for damage.
    • Is the ATC solenoid jumper harness damaged? 
    • Yes:  REPAIR or INSTALL a new ATC  solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.
    • No:  INSTALL a new rear axle assembly. REFER to REAR DRIVE AXLE/DIFFERENTIAL . CLEAR the DTCs. REPEAT the self-test.
  5. D5 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR AN OPEN WITH ATC SOLENOID CONNECTED 
    • Connect: ATC  Solenoid C4347 and ATC  Solenoid Jumper Harness C4004.
    • Measure the resistance between 4X4 control module C281-8, circuit CCF21 (VT/WH), harness side and 4X4 control module C281-16, circuit RCF21 (WH/VT), harness side.
      Fig 3: Measuring Resistance Between 4X4 Control Module C281-8, Circuit CCF21 (VT/WH) And 4X4 Control Module C281-16, Circuit RCF21 (WH/VT)
      G06064362Courtesy of FORD MOTOR CO.
    • Is the resistance less than 10 ohms? 
    • Yes:  GO to  D8.
    • No:  GO to D6  .
  6. D6 CHECK CIRCUITS CCF21 (VT/WH) AND RCF21 (WH/VT) FOR AN OPEN AT C4004 
    • Disconnect: ATC  Solenoid Jumper Harness C4004.
    • Measure the resistance between 4X4 control module C281-8, circuit CCF21 (VT/WH), harness side and ATC  solenoid jumper harness C4004-1, circuit CCF21 (VT/WH).
      Fig 4: Measuring Resistance Between 4X4 Control Module C281-8 And ATC Solenoid Jumper C4004-1
      G06064363Courtesy of FORD MOTOR CO.
    • Repeat this measurement while wiggling the harness.
    • Measure the resistance between 4X4 control module C281-16, circuit RCF21 (WH/VT), harness side and ATC  solenoid jumper harness C4004-2, circuit RCF21 (WH/VT), harness side.
      Fig 5: Measuring Resistance Between 4X4 Control Module C281-16 And ATC Solenoid Jumper Harness C4004-2
      G06098367Courtesy of FORD MOTOR CO.
    • Repeat this measurement while wiggling the harness.
    • Are the resistances less than 5 ohms? 
    • Yes:  GO to D7  .
    • No:  REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  7. D7 CHECK THE ATC SOLENOID CIRCUIT FOR AN INTERNAL OPEN 
    NOTE: The Active Torque Coupling (ATC) solenoid jumper harness must be secured to prevent damage to the wiring.
    • Disconnect: ATC  Solenoid C4347.
    • Measure the resistance between ATC  solenoid C4347-1, circuit CCF21 (VT/WH), component side, and ATC  solenoid C4347-2, circuit RCF21 (WH/VT), component side.
      Fig 6: Checking ATC Solenoid Circuit For An Internal Open
      G06064365Courtesy of FORD MOTOR CO.
    • Repeat this measurement while wiggling the harness.
    • Is the resistance less than 10 ohms? 
    • Yes:  REPAIR or INSTALL a new ATC  solenoid jumper harness. CLEAR the DTCs. REPEAT the self-test.
    • No:  INSTALL a new rear axle assembly. REFER to REAR DRIVE AXLE/DIFFERENTIAL . CLEAR the DTCs. REPEAT the self-test.
  8. D8 CHECK CIRCUIT GD140 (BK/GN) FOR AN OPEN 
    • Measure the resistance between 4X4 control module C281-15, circuit GD140 (BK/GN), harness side and ground.
      Fig 7: Measuring Resistance Between 4X4 Control Module C281-15, Circuit GD140 (BK/GN), Harness Side And Ground
      G06064366Courtesy of FORD MOTOR CO.
    • Repeat this measurement while wiggling the harness.
    • Is the resistance less than 5 ohms? 
    • Yes:  GO to D9  .
    • No:  REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  9. D9 CHECK THE 4X4 CONTROL MODULE POWER CIRCUITS 
    • Ignition ON.
    • Measure the voltage between 4X4 control module C281-6, circuit SBP11 (BU/RD), harness side and ground; and between 4X4 control module C281-5, circuit CBP35 (YE/GY), harness side and ground.
      Fig 8: Checking 4X4 Control Module Power Circuits
      G06505241Courtesy of FORD MOTOR CO.
    • Are the voltages greater than 10 volts? 
    • Yes:  GO to D10  .
    • No:  CHECK Smart Junction Box (SJB) fuses 11 (10A) and 35 (5A). REPAIR the circuit in question for open or short to ground. CLEAR the DTCs. REPEAT the self-test.
  10. D10 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION 
    • Disconnect: 4X4 Control Module C281.
    • Check the harness and component side connectors for:
      • corrosion.
      • pushed-out/bent pins.
    • Check the ATC  solenoid jumper harness between the 4X4 control module and the ATC  solenoid, located on the rear subframe.
    • Connect the 4X4 control module and make sure it seats correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    • Yes:  INSTALL a new 4X4 control module. REFER to 4X4 CONTROL MODULE . CLEAR the DTCs. REPEAT the self-test.
    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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